Hot-air furnace



(No Model.) J. GRAY.

HOT AIR FURNACE No. 397,919. Patented Feb. 19, 1889.

IIVVE/l/TOI? By 7? 7 //8 ATTORNEYS N. PETERS. Plwlu'ulhognphcr washinglnnv D. C,

UNITED STATES PATENT O FICE,

JOSEPH GRAY, OF CHICAGO, ILLINOIS.

HOT-Al R FU RNAC E.

SPECIFICATION forming part of Letters Patent No. 397,979, dated February 19, 1889. 7

Application filed March '7, 1888. Serial No. 266,458. (No model.)

To aZZ whom it may concern: The combustion-chamber C is centrally Be it known that I, JOSEPH GRAY, acitizcn cated in the furnace, and is inclosed by a of the United States of America, and a resiwall, 0', which, with the exterior casingof the dent ofthe city of Chicago, in the county of furnace D, forms an annular air-passage, g, 5 Cook and State of Illinios, have invented oeropening into the cold-air chamber G, contain new and useful Improvements in Hot-Air nected in the usual manner with the cold-air Furnaces, of which the following is a specifisupply. Over the combustion chamber is llplaced the cap or cover E, fitted tightly upon My invention relates to that class of furthe wall 0' by means of the flange c. This cap 1o naces which are designed to heat a currentof is provided with a series of perforations or air as it passes through them, and my object holes, 6' e, and into these holes are fitted a is to increase the heating-surface in contact number of tube-like pockets, I I, extending with the air as much as possible without madownward almost to the bottom of the comterially obstructing either the air-passages or bustion-chamber and containiu g partitions 2' 15 the smoke-fines. Many furnaces have been i, projecting downward into the same, dividconstructed with this end in view, the greater ing the interior into two passages or fines, g number of which leave the smoke-flue as diand 9 connecting at the bottom. rect as practicable and lead the air through Between the upper ends of the partitions ii passages projecting into the combustionand the outer casing, D, of the furnace i fit 2o chamber. These passages have been comted an annular plate or partition,J, having monly made in the form of annular rings, at its inner edge a downwardly-projecting usually concentric with the lire-pot and comflange, j, which rests upon the cover E of the bustion-chamber. The great disady'antage combustion-chamber, and is fitted closely to attendant upon this construction is the lack the upper edge of the partitions it, and at its 25 of free communication between the portion outer edge a projecting flange, j forming a vof the combustion-charmibcr within and that tight joint with the outer casing, D, of the without this ring. furnace. It will. be noticed that this partr My invention consists in dividing up these tion J cuts off all communication between the annular rings into a series of pockets orsepaouter air-space, g, and the hot-air chamber A, 30 rate passages, leaving room enough between except by means of the pockets I I through them to allow the hot gases to circulate freely the fines g and 9 between and around the same, and combining In the central portion of the combustion- .with said pockets a deflector, preferably 10- chamber is placed the deflector L, preferably catcd directly over the fire-pot and obstructclosing the central flue surrounded by the 35 ing the passage lcadingdirectly upward from pockets I I, and extending out a short disthe fire, thereby compelling the hot gases to tance between these pockets. The exact 10- pass out between and around the pockets becation of this deflector will be governed by fore escaping up the chimney. the style of furnace used, and any form of de- In the accompanying drz'nvings, Figure 1 is doctor may be employed which is adapted to 40 a vertical section of a furnace, showing my the furnace; but I prefer the cone-shaped deimproycments, taken in a plane passing llector shown in the drawings placed with the through its center; and Fig. 2 is a horizontal apex pointing upward, inasmuch as this form section taken in the line so .r of Fig. 1. is easily cleaned by t-appingit with ahammer.

I have chosen as a means of illustrating my Having thus described my invention, what 45 invention a portable furnace of the style and I claim as new, and desire to secure by Letshape in common use. It is hardly necessary tcrs Patent, isto state that they can be as well applied to 1. In a hot-air furnace, the combination of any other form of furnace. In this furnace the combustion-chambcrwithaseries of pock- A is the fire-pot; B, the ash-pit; b, the openets projecting into the same through which I00 50 ing into the ash-pit; c, the feed-door, and F the air circulates, and with adefiector located the smoke-pipe.

above the fire-pot and between these pockets to throw the heated products of combustion out above said deflector,whereby the greater porbetween and around the same before passing tion of the heated gases from the fire will be 01f up the chimney, as and. for the purpose made to pass outward between said pockets stated. and back again between the same before pass- 5 2. In a hot-air furnace, a series of pockets ing off up the chimney, as and for the pur- I 5 through which the air circulates projecting pose stated. downward into the coi'nbustion-ehalnber, in combination with a deflector located above \Vitnessesz the fire-pot and between these pockets, and an HARRY BITNER,

1o escape-flue for the smoke centrally located MALCOLM HILL.

JOSEPH GRAY. 

